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i checked processlist, there was a process "invalidating query cache entries (table)" and delayed Time "". i think this process is theĀ  invalidating query cache entries - MySQL Forums.



MySQL Query Cache

Invalidating query cache mysql

Invalidating query cache mysql


In a situation like this, the query cache can mask performance problems caused by missing indexes, which makes it helpful for novice users. It compares incoming queries that start with SEL to a hash table, and if there is a match returns the results from the previous execution of the query. Although MySQL Query Cache was meant to improve performance, it has serious scalability issues and it can easily become a severe bottleneck. For user facing systems, reducing the variability of performance is often more important than improving peak throughput: The query cache was designed to not serve stale results. This comment still yields true today, but I think it is important to also point out that DBA tools for poor-application-intervention have also improved:

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Invalidating query cache mysql

Invalidating query cache mysql


In a situation like this, the query cache can mask performance problems caused by missing indexes, which makes it helpful for novice users. It compares incoming queries that start with SEL to a hash table, and if there is a match returns the results from the previous execution of the query. Although MySQL Query Cache was meant to improve performance, it has serious scalability issues and it can easily become a severe bottleneck. For user facing systems, reducing the variability of performance is often more important than improving peak throughput: The query cache was designed to not serve stale results. This comment still yields true today, but I think it is important to also point out that DBA tools for poor-application-intervention have also improved: Invalidating query cache mysql

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MySQL 8.0 Removes Query Cache: Hitler Reacts

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